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I just joined the site today. I love the X5 model...I had a 2005 X5 3.0 and currently have a 2007 X5 3.0

Anyway i saw a 2006 X5 4.8is for sale today...have a bout 50k on it so pretty reasonable...Anyway i was wondering if these cars are generally reliable like mine have been? I have heard some stories of the air suspension being a nightmare and the tires(big ol things) being pretty pricey....Any other unusual costs associated with the 4.8 over the 3.0?